Circular size gage



Dec'. 9, 1947. E. s. CORNELL CIRCULAR SIZE GAGE Filed Dot. 20, 1945 2 Sheets-Sheet 1 Dec. 9, 1.947. E. s. CORNELL I 2,

CIRCULAR SIZE GAGE Filed 001;. 20, 1945 2 Sheets-S heet 2 ([0 m r. I gkw Patented Dec. 9, 1947 UNITED STATES PATENT OFFICE,

Elton s. CornelLCharlestownJN. '11., ass igno r to Bryant Chucking Grinder Company, Sprmgfield, Vt., a corporation ofyermont j Application October ,20, 1943; Serial No. 507,003

4 Claims. (01. 33 -178) ing work pieces and has for an object to provide opening of the gage when the work piece is be-' ing removed. This is of particular importance where the work pieces are sufiiciently large or heavy to require the use of both hands of the operator to place or remove the work piece. Since it is important that the pressure of the gaging elements on the work shall be uniform in order that the gage reading of different pieces shall be accurately comparable, the gaging pressure is determined, in accordance with this invention, by a spring, the gage opening force being applied in opposition to the spring.

A further object is to provide a gage automatically closed by pressure of a predetermined amount exerted through the work piece against the gage and automatically opened by release of such pressure.

Another object is to provide a gage of the type described wherein the weight of the work piece provides at least a portion of the force effective to cause the gage to be closed.

For a more complete understanding of this invention, reference may be had to the accompanying drawings in which i Figure 1 is a top plan view partly broken away and in sectionof an internal thread gage in which the invention is shown as embodied, the gage being shown in this figure in closed position.

Figures 2 and 3 are detail sectional views on lines 2-2 and 3'-3, respectively, of Figure 1.

Figure 4 is a fragmentary View similar to a portion of Figure 1, but showing the parts in gageopen positions.

Referring to the drawings, at l is indicated a stand for supporting the gage elements. As shown this stand is supported on a plurality of feet, herein shown as three such feet, two of them at 2, being fixed with relation to said stand, and a third, 3, being yieldable. As shown in Figure 2, the yieldable foot 3 is normally pressed downwardly by a spring 4 reacting between its upper face 5 and a plug 6 threaded into a vertical opening I in a portion of the frame I. By adjustment of the plug 6 the pressure with which the foot 3 is downwardly pressed may be adjusted. The plug 6 may be provided with holes 8 for the reception of a spanner wrench by which it may be adjusted. The foot 3 is provided with a shank 9 extending through a central opening of the plug 6. The upper end of the shank 9 is positioned beneath the actuating element of a normally 2 i closed switch I I suitably secured to the inner face of the stand I. Thus the parts are so arranged that when the'stand with the gaging elements carried thereby does not support a work piece to be gaged, the foot 3 is in extended condition so that the switch II is closed. Upon th application of. sufiicient downward pressure against the stand,'the stand may be depressed adjacent to thefoot 3, thus causing this foot to be lifted relative to thestand sufiiciently to actuate the elementrlll to open this switch ll.

Any suitable gaging means may be supported on the. stand I, but as shown this comprises a pair of fixed gaging anvils l5 each secured to a fixed member 19 and having external threads l6 thereon for engagement with internally threaded work. Cooperating with these fixed gaging anvils I5 is a movable anvil I! having gaging thread elements 18 adapted to engage with internal threads of the work piece shown in dotted lines in Figure 2 at 20. The movable gaging'element 11- is carried by an arm 24 positioned between the fixed anvils l5 and arcuate members [9, and is secured to a movable gaging arm 25 having an upright portion 26 connected by pairs of leaf springs 21 and 28 with an upright stationary member 29 fixed in any suitable way to the stand I, the arrangement being such that the gaging arm 25 is free to be flexed about a vertical axis Where the springs 21 and 28 cross so that the anvil threads l8 may be moved lengthwise of the space between the fixed gaging anvil supports l9. When the arm 25 is swung in clockwise direction as viewed in Figure 1 to bring the gaging teeth inwardly, the gage is opened so that work can be placed thereon, the gaging action taking place when the arm 25 is swung in counterclockwise direction to bring the three gaging anvils into gaging contact with the internally threaded work piece. The gage is normally held in gaging position as by means of a spring reacting between an arm 36 carried by the portion 26 and an adjustable plug 31 threaded through an opening 38throughthe side wall of the stand I. The age may be opened and so retained, however, by the energization of a solenoid 40, the plunger 4| of which, when the solenoid is energized, pressing against the arm 36 with a force superior to that of the spring 35 and moving the arm in opposition to the spring 35 to gage-open position, bringing the arm 25 into contact with an adjustable stop I 05. An adjustable stop 42 carried by the arm and engageable with the stationary face I limits the gage closed position of movement when no work piece is in gaging position.

This solenoid 40 is energized from a suitable source (not shown), the energy being controlled by the normally closed switch ii. Thus when the solenoid is energized, the pressure of the spring 35 is overcome and the gage is opened.

As shown in Figures 2 and 3 the gage may be provided with springs 58 and 5|, the springs 50 being secured to the outer faces of the fixed elements l9 and the spring 51 being secured to the outer face of the movable gage arm 24. These springs have their free ends turned inwardly in position to support the work piece 20 to be gaged. If now a work piece 29 be placed in position on the springs 5!] and 5!, as shown in dotted lines in Figure 2, and with its internal threads engaging with the fixed anvils l5, and sufiicient pressure be exerted downwardly On the stand, either partly or wholly through the weight of the work piece 20, to depress the stand at the movable foot 3 suificiently to open the switch H, the solenoid 40- is de-energized whereupon the spring 35 is free to swing the arm 2i; to gage-closed position, this bringing the thread points 13 into gaging relation with the work. The gaging position of the arm 25' is registered on any suitable mechanism such, for example, as the position indicator of well known type illustrated at 55 having the stem 56 which may be contacted by the arm 25. This gaging position of the anvil parts is shown in Figures 1, 2 and 3. If now the downward pressure of the work piece upon the gage be relieved, as by applying a lifting force to the work piece 20,- the' spring 4 raises the stand at the movable foot 3' sufiiciently for the switch H- to close, thus energizing the solenoid 4i! and swinging the movable gaging anvil ii to inoperative position, freeing the work therefrom, which can then be detached from the fixed gaging elements and removed. If desired, the movable anvil arm 24' may be provided with a portion 51 so positioned that when the movable gage element moves to open position'it engages the inner face of the work piece substantially diametrically opposite thereto and moves the work piece out of engagement with the fixed gaging elements 15 so that the work piece is freed automatically from all of the gaging elements when the gage is moved to open position. This portion 51 may be provided with a sloping outer face 58 which cooperates with arcuate portions 59' on the fixed elements T9 to guide the work piece as it is placed on the stand so that the work piece may be properly related to the gaging elements. Then when suflicient downward pressure is exerted on the stand, the gaging elements are immediately moved to gaging position with the work piece properly centered in relation thereto.

While as shown this gage is designed for gaging internally threaded work, it should be evident that the gage might be arranged for gaging external work and that the gaging anvils may be other than thread gaging anvils, if desired, so that either internal or external diameters of any desired configuration may be gaged. The work piece guiding and centering mechanism shown herein is not per sea part of the present invention.

From the foregoing description of an embodiment of this invention, it should be evident to those skilled in the art that various other changes and modifications might be made without de- 1parting from the spirit or scope of this invenion.

I claim:

1. A work gage having a relatively movable supporting portion for carrying the workto be gaged, gaging anvils relatively movable between gaging and gage open position, said anvils when in inoperative gage-open position freeing the work piece for removal and replacement, means tending to move and hold said anvils in gaging positions, means acting with a superior force in opposition to said tending means for opening and retaining said gage open, and means responsive to a predetermined amount of relative motion between said gage and supporting portion in one direction to'render inoperative said opposition acting means.

2. A work gage comprising a stand, spaced feet for supporting said stand, at least one of said feet being yieldable by application of a predetermined downward pressure exerted on said stand, a plurality of relatively movable work gaging elements carried by said stand, means tending to mov said elements relatively into engagement with a work piece supported by said stand, means of greater power than said tending means pressing said elements relatively toward inoperative retracted positions, and means actuated by the yielding of said foot to a predetermined extent to render said element pressing means inoperative.

3. A work gage comprising a stand, spaced feet for supporting said stand, at least one of said feet being yieldable by application of a predetermined downward pressure exerted on said stand, a plurality of relatively movable work gaging elements carried by said stand, electrical means when energized pressing said element-s relatively toward inoperative retracted positions in opposition to said tending means, and a normally closed switch controlling the energization of said electrical means arranged to be opened on yielding of said yielclable foot to a predetermined extent.

4. A work gage having a relatively movable gage supporting portion, gaging anvils relatively movable between gaging and gage-open positions, said anvils when in inoperative gage-open position freeing the work piece for removal and replacement, means to move and hold said anvils in gaging position, means to move and hold said anvils in open position, the second of said means normally overcoming the other of said means, and mechanism effective on one of said means on predetermined amount of relative motion between said gage and supporting portion in one direction to change the relative effectiveness of said means to cause the first-mentioned means to overcome said other means and change the relative positions of said anvils between gaging and open positions.

ELTON S. CORNELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,219,622 Buccicone Oct. 29, 1940 2,264,433 Buccicone Dec. 2, 1941 1,758,268 Wagner May 13, 1930 2,099,893 Jones NOV. 23, 1937 2,169,897 Lueckel Aug. 15, 1939 

